CVE-2024-49854

HighCVSS 7.8/10Last modified Aug 4, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

block, bfq: fix uaf for accessing waker_bfqq after splitting

After commit 42c306ed7233 ("block, bfq: don't break merge chain in bfq_split_bfqq()"), if the current procress is the last holder of bfqq, the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq may in the merge chain of bfqq, hence just recored waker_bfqq is still not safe.

Fix the problem by adding a helper bfq_waker_bfqq() to check if bfqq->waker_bfqq is in the merge chain, and current procress is the only holder.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
LinuxLinux>= e0c20d88b7dce85d2703bb6ba77bf359959675cd, < 63a07379fdb6c72450cb05294461c6016b8b7726; >= de6c5e3a456019d2182e345730e59721714fa0b5, < de0456460f2abf921e356ed2bd8da87a376680bd; >= 19f3bec2ac4be329b9bd12b18a989b867618d2d8, < 0780451f03bf518bc032a7c584de8f92e2d39d7f; >= 13b3d0e8cb121f99b11918a0d4bcc1ce4647d352, < 0b8bda0ff17156cd3f60944527c9d8c9f99f1583; >= 4780f50ea50cfe8e89fc3747bf3dd155488433bb, < cae58d19121a70329cf971359e2518c93fec04fe; >= 42c306ed723321af4003b2a41bb73728cab54f85, < 1ba0403ac6447f2d63914fb760c44a3b19c44eaf; 9e813033594b141f61ff0ef0cfaaef292564b041; 3a5f45a4ad4e1fd36b0a998eef03d76a4f02a2a8; 3630a18846c7853aa326d3b42fd0a855af7b41bc; >= 4.19.323, < 4.20; >= 5.4.285, < 5.5; >= 5.10.227, < 5.11
LinuxLinux—

References

Timeline

Published
Oct 21, 2024
Last modified
Aug 4, 2026
NVD status
Modified

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CVE-2024-49854: High severity, CVSS 7.8 | Vulnix